Prescription only Therios 300 mg tablets are used to treat bacterial skin infections in dogs (including deep and superficial dermatitis) caused by organisms sensitive to cephalexin. They can also be used to treat urinary tract infections in dogs (including nephritis and cystitis) caused by organisms sensitive to cephalexin. Each tablet contains: Active ingredient: Cephalexin (as cephalexin monohydrate) 300 mg Package size: A cardboard box containing 20 strips of 10 tablets each